using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.RateLimiting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using Microsoft.OpenApi.Models;

namespace ncwebapi
{
    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {

            services.AddControllers().AddXmlDataContractSerializerFormatters().ConfigureApiBehaviorOptions(setup => {
                setup.InvalidModelStateResponseFactory = context =>
                {
                    var problemDetails = new ValidationProblemDetails(context.ModelState) {
                        Type = "http://www.baidu.com",
                        Title = "有错误",
                        Status = StatusCodes.Status422UnprocessableEntity,
                        Detail = "请看详细信息",
                        Instance = context.HttpContext.Request.Path,
                    };

                    problemDetails.Extensions.Add("traceId", context.HttpContext.TraceIdentifier);

                    return new UnprocessableEntityObjectResult(problemDetails) {
                        ContentTypes = { "application/problem+json" }
                    };
                };
                
            });
            services.AddSwaggerGen(c =>
            {
                c.SwaggerDoc("v1", new OpenApiInfo { Title = "ncwebapi", Version = "v1" });
            });
            services.AddRateLimiter(c => c.AddFixedWindowLimiter("FixedWindow", option => {
                option.PermitLimit = 3;
                option.Window = TimeSpan.FromSeconds(5);
            }));
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
                app.UseSwagger();
                app.UseSwaggerUI(c => c.SwaggerEndpoint("/swagger/v1/swagger.json", "ncwebapi v1"));
            }
            //else {
            //    app.UseExceptionHandler(appBuilder =>
            //    {
            //        appBuilder.Run(async context => {
            //            context.Response.StatusCode = 500;
            //            await context.Response.WriteAsync("自定义错误信息");
            //        });
            //    });
            //}

            //app.UseStaticFiles();

            

            app.UseRouting();

            app.UseAuthorization();

            app.UseRateLimiter();

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllers();
            });
        }
    }
}
